[AIRFLOW-1694] Stop using itertools.izip
[AIRFLOW-1694] Stop using itertools.izip

Itertools.zip does not exist in Python 3.

Closes #2674 from yati-sagade/fix-py3-zip

(cherry picked from commit 6110139a8fd7069c87e3c99b3976865576180f67)
Signed-off-by: Bolke de Bruin <17f52a69a3ba26c79c8a88ef8c1f26312d9cbf0e@xs4all.nl>

Twistbioscience/incubator-airflow,Twistbioscience/incubator-airflow,Twistbioscience/incubator-airflow,Twistbioscience/incubator-airflow